- Chemical equation balance
This online calculator balances equations of chemical reactions.

- Gaussian elimination
The calculator solves the systems of linear equations using row reduction (Gaussian elimination) algorithm. The calculator produces step by step solution description.

This online calculator solves systems of linear equations using row reduction (Gaussian elimination) while retaining fractions on all calculation stages. At the end, it returns the results in two forms - as a floating point numbers and as a fractions (with numerator and denominator)

- Orthodox Easter date calculator
Using a modification of the Gauss algorithm to calculate Orthodox Easter date